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authorSinan Kaya <okaya@codeaurora.org>2017-07-12 00:04:14 -0400
committerBjorn Helgaas <bhelgaas@google.com>2017-07-31 14:31:22 -0500
commit62ce94a7a5a54aac80975f5e6731707225d4077e (patch)
treeaf6e5d8fb778bb2fe51a14dcde3b0355b1035bf5 /drivers/pci/pci.h
parent16f73eb02d7e1765ccab3d2018e0bd98eb93d973 (diff)
PCI: Mark Broadcom HT2100 Root Port Extended Tags as broken
Per PCIe r3.1, sec 2.2.6.2 and 7.8.4, a Requester may not use 8-bit Tags unless its Extended Tag Field Enable is set, but all Receivers/Completers must handle 8-bit Tags correctly regardless of their Extended Tag Field Enable. Some devices do not handle 8-bit Tags as Completers, so add a quirk for them. If we find such a device, we disable Extended Tags for the entire hierarchy to make peer-to-peer DMA possible. The Broadcom HT2100 seems to have issues with handling 8-bit tags. Mark it as broken. The pci_walk_bus() in the quirk handles devices we've enumerated in the past, and pci_configure_device() handles devices we enumerate in the future. Fixes: 60db3a4d8cc9 ("PCI: Enable PCIe Extended Tags if supported") Link: https://bugzilla.redhat.com/show_bug.cgi?id=1467674 Reported-and-tested-by: Wim ten Have <wim.ten.have@oracle.com> Signed-off-by: Sinan Kaya <okaya@codeaurora.org> [bhelgaas: changelog, tweak messages, rename bit and quirk] Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci/pci.h')
-rw-r--r--drivers/pci/pci.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 22e061738c6f..a6560c9baa52 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -235,6 +235,7 @@ enum pci_bar_type {
pci_bar_mem64, /* A 64-bit memory BAR */
};
+int pci_configure_extended_tags(struct pci_dev *dev, void *ign);
bool pci_bus_read_dev_vendor_id(struct pci_bus *bus, int devfn, u32 *pl,
int crs_timeout);
int pci_setup_device(struct pci_dev *dev);